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  <title>Document</title>
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  <!-- 
      1. 安装工具 npm i babel-cli babel-preset-env browserify(webpack) -D
      2. 编译 npx babel src/js -d dist/js --presets=babel-preset-env
      3. 打包 npx browserify dist/js/app.js -o dist/bundle.js
  -->

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<script src="./dist/bundle.js"></script>
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